Officials at the U.S. Environmental Protection Agency and the U.S. Department of Agriculture have unveiled proposals to curb the emergence of insects resistant to the insecticidal Bacillus thuringiensis (Bt) toxin. The position paper, which closely follows the agbio industry's voluntary code of practice, introduced in January, has attracted criticism from environmentalists.

The EPA and USDA Position Paper on Insect Resistance Management in Bt Crops sets out details for the creation of